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Work is determined by the product of the force used on the object and the distance the object was moved.
W = Fd
In this case you have the work = 2.1 J, and need to know the distance.
That implies that you know the force. One definition of force is the weight of an object due to the acceleration of gravity acting on the object. Fw = mg, where m is the mass in kg, and g is 9.8m/s/s.
In your problem, Fw = 0.179 * 9.8 = 1.75 N
So solve for d: d = E/F = 2.1/1.75 = 1.2 m
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